Hitung luas abc? Jika ce=12 dan ae= 7 Tolong yaa bantu adik lupa rumus

L.abc
= 1/2 x alas x tinggi
= 1/2 x (7+7) x 12
= 1/2 x 14 x 12
= 84 cm²

L(Δabc) = 1/2×(ab)×(ce)
= 1/2× (ae+eb)×(ce)
Karena ae=eb maka ae+eb=2ae
= 1/2× 2× (ae)×(ce)
= (ae)×(ce)
= 7×12
=84